//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package com.feilong.lib.ognl;

import com.feilong.lib.ognl.enhance.UnsupportedCompilationException;

/**
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
class ASTTest extends ExpressionNode{

    /**
     * 
     */
    private static final long serialVersionUID = 2651347502163713066L;

    public ASTTest(int id){
        super(id);
    }

    public ASTTest(OgnlParser p, int id){
        super(p, id);
    }

    @Override
    protected Object getValueBody(OgnlContext context,Object source) throws OgnlException{
        Object test = _children[0].getValue(context, source);
        int branch = OgnlOps.booleanValue(test) ? 1 : 2;
        return _children[branch].getValue(context, source);
    }

    @Override
    protected void setValueBody(OgnlContext context,Object target,Object value) throws OgnlException{
        Object test = _children[0].getValue(context, target);
        int branch = OgnlOps.booleanValue(test) ? 1 : 2;
        _children[branch].setValue(context, target, value);
    }

    @Override
    public String getExpressionOperator(int index){
        return (index == 1) ? "?" : ":";
    }

    @Override
    public String toGetSourceString(OgnlContext context,Object target){
        if (target == null){
            throw new UnsupportedCompilationException("evaluation resulted in null expression.");
        }

        if (_children.length != 3){
            throw new UnsupportedCompilationException("Can only compile test expressions with two children." + _children.length);
        }

        String result = "";

        try{

            String first = OgnlRuntime.getChildSource(context, target, _children[0]);
            if (!OgnlRuntime.isBoolean(first) && !context.getCurrentType().isPrimitive()){
                first = OgnlRuntime.getCompiler().createLocalReference(context, first, context.getCurrentType());
            }

            if (ExpressionNode.class.isInstance(_children[0])){
                first = "(" + first + ")";
            }

            String second = OgnlRuntime.getChildSource(context, target, _children[1]);
            Class secondType = context.getCurrentType();

            if (!OgnlRuntime.isBoolean(second) && !context.getCurrentType().isPrimitive()){
                second = OgnlRuntime.getCompiler().createLocalReference(context, second, context.getCurrentType());
            }

            if (ExpressionNode.class.isInstance(_children[1])){
                second = "(" + second + ")";
            }

            String third = OgnlRuntime.getChildSource(context, target, _children[2]);
            Class thirdType = context.getCurrentType();

            if (!OgnlRuntime.isBoolean(third) && !context.getCurrentType().isPrimitive()){
                third = OgnlRuntime.getCompiler().createLocalReference(context, third, context.getCurrentType());
            }
            if (ExpressionNode.class.isInstance(_children[2])){
                third = "(" + third + ")";
            }

            boolean mismatched = (secondType.isPrimitive() && !thirdType.isPrimitive())
                            || (!secondType.isPrimitive() && thirdType.isPrimitive()) ? true : false;

            result += "ognl.OgnlOps.booleanValue(" + first + ")";

            result += " ? ";

            result += (mismatched ? " ($w) " : "") + second;
            result += " : ";

            result += (mismatched ? " ($w) " : "") + third;

            context.setCurrentObject(target);
            context.setCurrentType(mismatched ? Object.class : secondType);

            return result;

        }catch (NullPointerException e){

            // expected to happen in some instances
            throw new UnsupportedCompilationException("evaluation resulted in null expression.");
        }catch (Throwable t){
            throw OgnlOps.castToRuntime(t);
        }
    }
}
